WO2010093202A2

WO2010093202A2 - Relay system based on resource allocation

Info

Publication number: WO2010093202A2
Application number: PCT/KR2010/000913
Authority: WO
Inventors: 이희수; 안재영; 노태균
Original assignee: 한국전자통신연구원
Priority date: 2009-02-13
Filing date: 2010-02-12
Publication date: 2010-08-19
Also published as: KR20100092910A; US8902807B2; KR101633516B1; US20110310792A1; WO2010093202A3

Abstract

The present invention relates to a communication field, more particularly to a communication system that transmits data using a relay. The invention enables the efficient allocation of wireless resources for transmission and reception links between a base station and a relay, the base station and a terminal, and the relay and the terminal.

Description

Relay system based on resource partitioning

The present invention relates to the field of mobile communications, and more particularly, to a communication system for transmitting data using a relay.

1 is a diagram illustrating each link in a data transmission system using a relay. The data transmission system includes a base station 110,

relays

120 and 150, a macro terminal 130, and a relay terminal 140. The macro terminal 130 is a terminal that directly connects to the base station 110 and transmits data to or receives data from the base station 110. The relay terminal 140 is connected to the relay 120.

The relay terminal 140 transmits data to the relay 120, and the relay 120 forwards the received data to the base station 110. In addition, the base station 110 transmits data to the relay 120, the relay 120 transmits the received data to the relay terminal 140.

The base station 110, the

relays

120 and 150, and the

terminals

130 and 140 may transmit or receive data using radio resources. According to an embodiment, a frequency band, a time interval, or the like may be used as a radio resource.

The data transmission system includes a phase and a downlink between the base station 110 and the relay 120, a phase and a downlink between the relay 120 and the relay terminal 140, and a phase and downlink between the base station 110 and the macro terminal 130. In this case, the radio resources are appropriately allocated to each other, and data is transmitted using the allocated radio resources.

2 is a diagram illustrating the structure of a data frame in the case of transmitting data by dividing a frequency resource.

2 (a) is a diagram illustrating a structure of a data frame transmitted by a base station to a relay. The data frame 210 may include a control signal region 211 and

data regions

212, 213, and 214.

The horizontal axis of the data frame 210 represents the passage of time, and the vertical axis represents the frequency band.

The control signal region 211 may transmit control signals corresponding to a reference signal (RS), a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), and a physical H-ARQ indicator channel (PHICH). In addition, the control signal region 211 may include information about a radio region corresponding to the data region or the data region. For example, the control signal region 211 may include information about a start point, an end point, and a band of a frequency at which each region is transmitted.

The

data area

212, 213, 214 may include data transmitted to the plurality of

relays

212, 213 or data 214 transmitted to the macro terminal. Data 214 transmitted to the macro terminal may be transmitted using a physical downlink shared channel (PDSCH).

FIG. 2B is a diagram illustrating the operation of the first relay for each area of the data frame shown in FIG. The first relay transmits a control signal 221 for relay terminals.

The first relay also receives data 223 for the first relay.

According to the embodiment shown in FIG. 2, the first relay does not perform any operation on a radio resource that transmits data 222 for the second relay and data 224 for the macro terminal. Therefore, these radio resources are wasted.

An object of the present invention is to effectively divide and allocate radio resources allocated to a data transmission system for transmission and reception links between a base station and a relay, transmission and reception links between a base station and a terminal, and transmission and reception links between a relay and a terminal.

In order to achieve the above object and solve the problems of the prior art, the present invention transmits the second data to the first terminal using the receiver and the second radio resource for receiving the first data from the base station using the first radio resource. It provides a relay including a transmission unit.

According to one aspect of the invention, the relay includes a receiving unit for receiving the first data received from the relay by using a first radio resource from the relay using a second radio resource, the base station is to receive the second radio resource A terminal for transmitting second data to a second terminal is provided.

According to still another aspect of the present invention, there is provided a relay including a transmitter for transmitting first data to a base station using a first radio resource and a receiver for receiving second data from a first terminal using a second radio resource. Is provided.

According to another aspect of the present invention, the first radio resource includes a receiving unit for receiving the first data from the relay, and using the second radio resource to receive the second data from the first terminal, the relay A base station for receiving the third data from the second terminal using the second radio resource is provided.

According to the present invention, radio resources can be effectively allocated to the transmission / reception link between the base station and the relay, the transmission / reception link between the base station and the terminal, and the transmission / reception link between the relay and the terminal.

1 is a diagram illustrating each link in a data transmission system using a relay.

3 is a diagram illustrating a structure of a data frame to which radio resources are allocated according to an embodiment of the present invention.

4 is a diagram illustrating a structure of a downlink data frame to which radio resources are allocated according to another embodiment of the present invention.

5 is a diagram illustrating a structure of an uplink data frame to which radio resources are allocated according to another embodiment of the present invention.

6 is a diagram illustrating a structure of a data frame to which radio resources are allocated according to another embodiment of the present invention.

7 illustrates a structure of a data frame to which radio resources are allocated according to another embodiment of the present invention.

8 is a diagram illustrating a structure of a data frame to which radio resources are allocated according to another embodiment of the present invention.

9 is a diagram showing the structure of a relay according to an embodiment of the present invention.

10 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.

11 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

12 is a diagram showing the structure of a relay according to another embodiment of the present invention.

3 (a) is a diagram illustrating a structure of a data frame transmitted from a base station to a relay. 3 (a) is similar to FIG. 2 (a), and thus a detailed description thereof will be omitted.

The first radio resource for the base station to transmit data 313 for the first relay, the second radio resource for the radio resource for transmitting the data 312 for the second relay, and the base station for the macro terminal. Let the radio resource that transmits the data 314 be a third radio resource.

FIG. 3B is a diagram illustrating an operation of the first relay for each area of the data frame shown in FIG. 3A. The first relay receives data 323 for the first relay. That is, the first relay receives data using the first radio resource.

The first relay transmits data for the relay terminal to the relay terminal using the second radio resource 322 or the third radio resource 324. That is, the first relay may transmit data or receive data by using all radio resources allocated to the data transmission system. Since the radio resources that are not used and wasted can be minimized, the radio resources can be efficiently used and the efficiency of the data transmission system is improved.

In FIG. 3, only a frequency band is illustrated as an example of a radio resource, but according to another embodiment of the present invention, a time interval may be used as the radio resource. In this case, the present invention can be similarly applied to the time interval.

4A is a diagram illustrating a structure of a downlink data frame 410 transmitted by a base station to a relay. The downlink data frame 410 transmitted by the base station to the relay includes a control signal region 411 and a

data region

412, 413, and 414.

The base station directly transmits control signals such as a reference signal (RS), a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), and a physical HARQ indicator channel (PHICH) using the control signal region 411. To transmit to the macro terminal and relay receiving.

The base station also transmits data for the second relay, data for the first relay, and data for the macro terminal using the

data areas

412, 413, and 414.

4B is a diagram illustrating a structure of a downlink data frame 420 received by a first relay from a base station. The downlink data frame 420 received by the first relay from the base station includes a control signal region 421 and a

data region

422, 423, 424.

The first relay receives a control signal such as RS, PCFICH, PDCCH, PHICH from the base station using the control signal region 421. The first relay also receives data from the base station using the data area 423. The radio resource region 423 used by the first relay to receive data from the base station corresponds to the radio resource region 413 through which the base station transmits data to the first relay.

According to an embodiment of the present invention, the relay may transmit and receive data using a plurality of FAs or a plurality of component carriers. In this case, the FA or component carrier used by the relay to receive data from the base station and the FA or component carrier used by the relay to transmit data to the relay terminal may be different.

4C illustrates downlink data in which a relay transmits data to a relay terminal when the FA or component carrier in which the relay receives data from the base station and the FA or component carrier in which the relay transmits data to the relay terminal are different. It is a figure which shows the structure of a frame. The downlink data frame shown in FIG. 4C uses a different FA or component carrier than the data frame shown in FIG. 4B. That is, the radio resources of the downlink data frame illustrated in FIG. 4C do not correspond to the radio resources illustrated in FIGS. 4A and 4B.

The downlink data frame 430 for the relay to transmit data to the relay terminal includes a control signal area 431 and

data areas

432, 433, 434.

The relay transmits control signals such as RS, PCFICH, PDCCH, and PHICH to the relay terminal using the control signal region 431.

In addition, the relay may transmit data to the first relay terminal, the second relay terminal, and the third relay terminal using the

data areas

432, 433, and 434.

In FIG. 4, an embodiment in which a relay receives data or transmits data using a plurality of FAs or a plurality of component carriers is illustrated. In this case, as shown in FIG. 4, the relay may operate by dividing a frequency band for receiving data and a carrier component for transmitting data.

According to another embodiment of the present invention, the relay may receive data or transmit data using a single FA or component carrier. In this case, the relay divides radio frequency resources in a single carrier component and transmits data to the relay terminal. Data may be received from the base station.

FIG. 5 (a) is a diagram illustrating a structure of an uplink data frame for a base station to receive data from a relay or macro terminal.

The base station receives the PUCCH (Physical Uplink Control Channel) from the macro terminal or the relay by using the first radio resource 511.

The base station performs no operation on the second radio resource 512.

The base station receives data from the first relay using the third radio resource 513 and receives data from the second relay using the fourth radio resource 514. The data received by the base station may include a shared channel (SCH) or control information (CI).

The base station also receives the PUSCH from the macro terminal using the fifth radio resource 515.

The base station receives the PUCCH from the macro terminal or the relay using the sixth radio resource 516.

FIG. 5B is a diagram illustrating the structure of a data frame transmitted by the first relay to the base station when the base station operates as described in FIG.

The first relay transmits the PUCCH to the base station using the first radio resource 521 and the sixth radio resource 525. The first relay also transmits data to the base station using the third radio resource 523. The first radio resource 521, the third radio resource 523, and the sixth radio resource 525 illustrated in FIG. 5B correspond to the first radio resource 511 illustrated in FIG. 5A, Corresponding to the third radio resource 513 and the sixth radio resource 516, respectively.

According to an embodiment of the present invention, the relay may transmit and receive data using a plurality of FAs or a plurality of component carriers. In this case, the FA or component carrier used by the relay to transmit data to the base station and the FA or component carrier used by the relay to receive data from the relay terminal may be different.

5C illustrates uplink data in which a relay receives data from a relay terminal when an FA or component carrier in which a relay transmits data to a base station and an FA or component carrier in which a relay receives data from a relay terminal are different. It is a figure which shows the structure of a frame. The uplink data frame shown in (c) of FIG. 5 uses a FA or component carrier different from the data frame shown in (b) of FIG. 5. That is, the radio resources of the downlink data frame illustrated in FIG. 4C do not correspond to the radio resources illustrated in FIGS. 4A and 4B.

The relay receives the PUCCH from the first relay terminal using the first radio resource 531 and receives the PUCCH from the second relay terminal using the third radio resource 533. In addition, the PUCCH is received from the third relay terminal using the fourth radio resource 534, the PUCCH is received from the fourth relay terminal using the fifth radio resource 535, and the sixth radio resource 536 is received. Receive the PUCCH from the fifth relay terminal.

In FIG. 5, an embodiment in which a relay receives data or transmits data using a plurality of FAs or a plurality of component carriers is illustrated. In this case, as shown in FIG. 5, the relay may operate by distinguishing an FA or a component carrier for receiving data from an FA or a component carrier for transmitting data.

According to another embodiment of the present invention, the relay may receive data or transmit data using a single FA or component carrier. In this case, the relay divides radio frequency resources in a single FA or component carrier to receive data from the relay terminal. Data can be sent to the base station.

6 is a diagram illustrating another embodiment of an operation of a base station and a relay for each radio resource when the base station receives data from a relay or a macro terminal.

6 (a) is a diagram illustrating the operation of a base station.

The base station receives the PUCCH from the macro terminal or relays using the first radio resource 611.

The base station performs no operation on the second radio resource 612.

The base station receives data from the first relay using the third radio resource 613 and receives data from the second relay using the fourth radio resource 614.

In addition, the base station receives the PUSCH from the macro terminal using the fifth radio resource 615.

The base station receives the PUCCH from the macro terminal and the relays using the sixth radio resource 616.

FIG. 6B illustrates an operation of the first relay when the base station operates as shown in FIG. 6A.

The first relay transmits the PUCCH to the base station using the first radio resource 621 and the sixth radio resource 625.

The first relay transmits data to the base station using the fourth radio resource 623. The first relay performs no operation on the second to third radio resources 622 and the fifth radio resource 624.

5 and 6, there may be a radio resource in which the first relay performs no operation. In order to efficiently use this wasted radio resource, a radio resource that is not used may be allocated for the relay to receive data from the relay terminal. That is, when the relay transmits data using only some of the uplink resources to the base station, other data may be received from the relay terminal using other radio resources.

FIG. 7 is a diagram illustrating another embodiment of an operation of a base station and a relay for each radio resource when the base station receives data from a relay or a macro terminal.

FIG. 7A is a diagram illustrating the operation of a base station.

The base station receives the PUCCH from the macro terminal using the first radio resource 711.

The base station performs no operation on the second radio resource 712.

The base station receives data from the first relay using the third radio resource 713 and receives data from the second relay using the fourth radio resource 714.

The base station also receives the PUSCH from the macro terminal using the fifth radio resource 715 and receives the PUCCH from the macro terminal using the sixth radio resource 716.

FIG. 7B is a diagram illustrating the operation of the first relay when the base station operates as shown in FIG. 7A.

The first relay receives the PUCCH from the relay terminal using the first radio resource 721.

The first relay does not perform any operation on the second radio resource 722.

The first relay transmits data to the base station using the third radio resource 723.

The first relay receives the PUSCH from the relay terminal using the fourth radio resource and the fifth radio resource 724 and receives the PUCCH from the relay terminal using the sixth radio resource 725.

7C is a diagram illustrating the operation of the base station.

The base station receives the PUCCH from the macro terminal using the first radio resource 731.

The base station performs no operation on the second radio resource 732.

The base station receives data from the first relay using the third radio resource 733 and receives data from the second relay using the fourth radio resource 734. The data received by the base station may include a shared channel (SCH) or control information (CI).

In addition, the base station receives the PUSCH from the macro terminal using the fifth radio resource 755 and receives the PUCCH from the macro terminal using the sixth radio resource 756.

FIG. 7D is a diagram illustrating the operation of the first relay when the base station operates as shown in FIG. 7C.

The first relay receives the PUCCH from the relay terminal using the first radio resource 741.

The first relay does not perform any operation on the second radio resource 742.

The first relay transmits data to the base station using the third radio resource 744.

The first relay receives the PUSCH from the relay terminal using the fourth radio resource and the fifth radio resource 726, and receives the PUCCH from the relay terminal using the sixth radio resource 747.

Magnetic interference may be suppressed by providing a protection resource between the

radio resources

741, 746, 747 that receive the PUCCH or PUSCH from the relay terminal and the radio resource 744 that transmits data to the base station.

FIG. 8 is a diagram illustrating another embodiment of an operation of a base station and a relay for each radio resource when the base station receives data from a relay or a macro terminal.

In FIG. 7,

radio resources

721, 725, 741, and 747 for receiving a PUCCH from a relay terminal are allocated to both edges of an uplink band. In contrast, in FIG. 8,

radio resources

821, 825, 841, and 847 are allocated to both edges of the relay to transmit the PUCCH to the base station.

Hereinafter, since the base station and the relay perform operations similar to those of the embodiment shown in FIG. 7 for other radio resources, detailed descriptions thereof will be omitted.

The relay 900 includes a receiver 910 and a transmitter 920.

The receiver 910 receives the first data from the base station 930 using the first radio resource. At least one of a time interval and a frequency band may be used as a radio resource.

The transmitter 920 transmits the second data to the relay terminal 950 using the second radio resource.

According to an embodiment, the receiver 910 may receive information about a first radio resource or a second radio resource, and may receive first data based on the information on each radio resource. Information about when each radio resource starts, information about when each radio resource ends, and information about a frequency band of each radio resource may be used as information about the radio resource.

The base station 940 transmits the third data from the macro terminal 940 using the second radio resource.

According to an embodiment, the first radio resource and the second radio resource may be radio resources adjacent to each other. That is, when the radio resource is a time interval, the first radio resource and the second radio resource may be radio resources adjacent to each other in time. In addition, when the radio resource is a frequency band, the first radio resource and the second radio resource may be adjacent frequency bands. The relay receives downlink data using the first radio resource and transmits uplink data using the second radio resource. If radio resources allocated to the uplink and downlink are adjacent to each other, data transmission performance may be reduced due to magnetic interference. To prevent this, a protection resource may be placed between the first radio resource and the second radio resource.

The relay shown in FIG. 9 receives first data from a base station using only some radio resources of downlink, and transmits second data to a terminal using other radio resources. Therefore, wasted radio resources are minimized, and data transmission efficiency of the data transmission system is improved.

The terminal 1000 may include a receiver 1010.

The receiver 1010 receives first data from the relay 1020 by using a second radio resource. The relay 1020 receives first data from the base station 1030 using the first radio resource, and forwards the first data to the terminal 1000 using the second radio resource.

The base station 1030 transmits the second data to the second terminal 1040 by using the second radio resource.

That is, the terminal 1000 illustrated in FIG. 10 receives first data from the relay 1020 using only some radio resources of the downlink. The relay 1020 transmits data to the relay using another radio resource. In addition, the base station 1030 transmits data to the second terminal 1040 by using a radio resource that the terminal 1000 receives the first data. Since the same radio resource is recycled, wasted radio resources are minimized and data transmission efficiency of the data transmission system is improved.

According to an embodiment, the first radio resource or the second radio resource may include at least one of a time interval and a frequency band.

Referring to FIG. 10, a relay receives downlink data using a first radio resource and transmits uplink data using a second radio resource. If radio resources allocated to the uplink and downlink are adjacent to each other, data transmission performance may be reduced due to magnetic interference. To prevent this, a protection resource may be placed between the first radio resource and the second radio resource.

The base station 1100 according to the present invention includes a receiver 1110 and a transmitter 1120.

The receiver 1110 receives first data from the relay 1130 by using a first radio resource and receives second data from the first terminal 1140 by using a second radio resource. The first terminal 1140 is a terminal that directly connects to the base station 1100 and transmits data to the base station 1100 and may be referred to as a macro terminal.

The first data received by the receiver 1110 from the relay 1130 may be received by the relay 1130 from the second terminal 1150 using the second radio resource. That is, the relay 1130 receives the first data from the second terminal 1150 by using the second radio resource and forwards the first data to the base station 1100 by using the first radio resource.

According to an embodiment, the relay 1130 may operate according to a time interval. During the first time period, the relay 1130 receives the first data from the second terminal using the second radio resource, and during the second time period, the relay 1130 uses the first radio resource to transmit the first data to the base station. Forward to 1100. In addition, during the second time interval, the relay 1130 may receive third data from the second terminal 1150 using the second radio resource.

According to an embodiment of the present invention, the first radio resource or the second radio resource may include at least one of a time point at which each data transmission starts, a time point at which each data transmission ends, and a frequency band in which each data is transmitted. Can be. That is, it may include information on the time interval or information on the frequency band.

According to an embodiment, the base station 1100 may determine an operation to be performed by the relay 1130 or the

terminals

1140 and 1150 for each radio resource. In addition, the ratio of the first radio resource and the second radio resource among the entire radio resources may be determined.

According to an embodiment, the transmitter 1120 transmits the information on the first radio resource and the information on the second radio resource to the relay 1130, and the relay 1130 may transmit the information on the first radio resource and the second radio resource. The first data may be transmitted to the base station 1100 or the third data may be received from the second terminal 1150 with reference to the information on the radio resource.

Referring to FIG. 11, the relay 1130 transmits first data by using a first radio resource and receives third data by using a second radio resource. In this case, data transmission performance may be reduced due to magnetic interference. To prevent this, a protection resource may be placed between the first radio resource and the second radio resource.

The relay 1200 may include a transmitter 1210 and a receiver 1220.

The transmitter 1210 transmits first data to the base station 1230 using the first radio resource.

The receiver 1220 receives second data from the first terminal 1250 using the second radio resource. The first terminal 1250 is a terminal connected to the base station 1230 via the relay 1200 and may be referred to as a relay terminal.

In addition, the base station 1230 receives the third data from the second terminal 1240 using the second radio resource. The second terminal 1240 is a terminal directly connected to the base station 1230 and may be referred to as a macro terminal.

The relay shown in FIG. 12 transmits the first data to the base station using only a part of uplink radio resources, and receives the second data from the terminal using other radio resources. Therefore, wasted radio resources are minimized, and data transmission efficiency of the data transmission system is improved.

Claims

A receiver which receives first data from a base station using a first radio resource;

A transmitter for transmitting second data to the first terminal by using the second radio resource;

Relay comprising a.
The method of claim 1,

And the first radio resource and the second radio resource are located in different FAs or different component carriers.
The method of claim 1,

And the second radio resource is used by the base station to transmit third data to a second terminal.
The method of claim 1,

And the first radio resource or the second radio resource includes at least one of a time interval and a frequency band.
The method of claim 1,

And the receiving unit receives the information on the first radio resource and receives the first data based on the information on the first radio resource.
The method of claim 1,

And the receiving unit receives a reference signal from the base station and receives the first data with reference to the reference signal.
The method of claim 6,

A channel estimator estimating a channel using the reference signal

Contains more

And the receiving unit receives the first data using the channel estimation result.
The method of claim 6,

And the receiver receives information about a radio resource through which the reference signal is transmitted from the base station, and receives the reference signal based on information about a radio resource through which the reference signal is transmitted.
The method of claim 1,

And a guard resource between the first radio resource and the second radio resource.
Receiving unit for receiving the first data received by the relay from the base station using a first radio resource from the relay using a second radio resource

Including,

The base station is a terminal for transmitting the second data to the second terminal by using the second radio resource.
The method of claim 10,

The first radio resource or the second radio resource includes at least one of a time interval and a frequency band.
The method of claim 10,

The receiving unit receives the information on the first radio resource and the information on the second radio resource and receives the first data based on the information on the first radio resource and the information on the second radio resource. terminal.
The method of claim 10,

And a guard resource between the first radio resource and the second radio resource.
Receiving unit for receiving the first data from the relay using the first radio resource, and receiving the second data from the first terminal using the second radio resource

Including,

The relay base station receives the third data from the second terminal using the second radio resource.
The method of claim 14,

The first radio resource or the second radio resource base station comprises at least one of a time interval, a frequency band.
The method of claim 14,

And a guard resource between the first radio resource and the second radio resource.
The method of claim 14,

Transmitter for transmitting the information on the first radio resource and the information on the second radio resource to the relay

More,

And the relay transmits the first data based on the information on the first radio resource and the information on the second radio resource.
A transmitter for transmitting first data to the base station using the first radio resource; And

Receiving unit for receiving the second data from the first terminal by using the second radio resource

Relay comprising a.
The method of claim 18

And the first radio resource and the second radio resource are located in different FAs or different component carriers.
The method of claim 18,

Wherein the second radio resource is used by the base station to receive third data from a second terminal.
The method of claim 18,

And the first radio resource or the second radio resource includes at least one of a time interval and a frequency band.